Compare Viagra vs. Cialis

Head-to-head comparisons of medication uses, side effects, ratings, and more.

Viagra (sildenafil)

Prescription only

Cialis (tadalafil)

Prescription only
Helps you get aroused and achieve an erection/orgasm.

Viagra (sildenafil) is an effective, first-choice treatment for erectile dysfunction. However, you need to take Viagra (sildenafil) at least 30 minutes before having sex, so the lack of spontaneity may not work for some people.

3.7/ 5 average rating with 843 reviewsforViagra
Helps you get aroused and achieve an erection/orgasm.

Cialis (tadalafil) is very effective and is the only medication in its class that treats both erectile dysfunction and enlarged prostate symptoms. You can also take it on a regular basis, which can allow for more spontaneity, but it can be expensive.

3.6/ 5 average rating with 606 reviewsforCialis
Upsides
  • Viagra (sildenafil) is the first-choice medication for treating erectile dysfunction.
  • Viagra (sildenafil) does not have to be taken everyday, it can be taken when you need it.
  • Cialis (tadalafil) is the first-choice medication for treating erectile dysfunction.
  • Cialis (tadalafil) can be taken either as needed, or on a regular basis (which allows you to be more spontaneous before sex).
  • Cialis (tadalafil) has longer lasting effects than Viagra.
Downsides
  • Viagra (sildenafil) can't be taken if you've had a heart attack in the past 3 months, or stroke or heart failure in the past 6 months.
  • Viagra (sildenafil) can cause flushing, headache and dizziness, or sudden hearing and vision changes.
  • You can't use Viagra (sildenafil) if you've recently taken nitrates like Isordil, Imdur, or nitroglycerin (Nitro-BID, Nitro-Dur, Nitrostat).
  • You can't take Cialis (tadalafil) if you've had a heart attack in the past 3 months, or stroke or heart failure in the past 6 months.
  • Cialis (tadalafil) is only available as brand name, so it can be expensive.
  • If you're older than age 65, you might have more side effects.
  • Can't use Cialis (tadalafil) if you've recently taken nitrates like Isordil, Imdur, or nitroglycerin (Nitro-BID, Nitro-Dur, Nitrostat).
Used for
Dosage forms
  • Pill
  • Pill
Price
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Reviews
843 reviews so far
67%
saidit'sworth it
51%
saiditworked well
16%
saidit'sa big hassle

Have you used Viagra (sildenafil)?

Leave a review
606 reviews so far
66%
saidit'sworth it
46%
saiditworked well
14%
saidit'sa big hassle

Have you used Cialis (tadalafil)?

Leave a review
Side effects
9possible side effects
  • Headache
    16%
  • Flushing
    10%
  • Indigestion
    7%
  • Nasal Congestion
    4%
  • Urinary Tract Infection
    3%
  • Abnormal Vision
    3%
  • Diarrhea
    3%
  • Dizziness
    2%
  • Rash
    2%
See more detailed side effects
4possible side effects
  • Headache
    4%
  • Indigestion
    2%
  • Back pain
    2%
  • Common cold
    2%
See more detailed side effects
Risks and risk factors
  • Heart attack or stroke
    • Having a heart attack, stroke, or rhythm problem in your heart in the last 6 months
  • Prolonged erection
  • Vision changes
    • Men over 50 years of age
  • Hearing loss
  • Low blood pressure
    • Taking alpha blockers
    • Taking medications for high blood pressure
    • Drinking alcohol
See more detailed risks and warnings
  • Heart disease
  • Prolonged erection
  • Vision changes
  • Low blood pressure
    • Taking alpha blockers
    • Taking medications for high blood pressure
    • Drinking alcohol
  • Hearing loss
See more detailed risks and warnings